2 Set of 1 inch Pressure Vacuum Breaker Vent Float Kit includes vent float repair kit, stainess steel Spring, rubber sealed loop. Fits 1 inch 800QT backflow valves and 1 inch PVB inlet and outlet pipes. When water is being used, the breaker bonnet assembly controls airflow and ensures that the backflow valve stays open under normal operating conditions; when water is not being used, the float and spring form a closed loop that prevents upstream sewage from flowing into the drinking water source. Improves system stability and optimizes water flow efficiency. 1 inch 800QT backflow valves and 1 inch PVB inlet and outlet pipes. With a maximum pressure of 150psi and a minimum pressure of 15psi, it can be used in a wide variety of plumbing applications such as industrial plants, swimming pools, lawn sprinklers, residential and other waterproof backflow systems for a wide range of plumbing needs. 800m4 vent float repair kit is very easy to install, simply open the vacuum valve and replace the return kit to restore the return valve system to normal operation, eliminating the need for costly and time-consuming replacement repairs. Made of high quality plastic to withstand long term use and sustained water pressure and repair freeze damage leaks. Improves system stability and optimizes water flow efficiency. Color: As Shown Material: Metal Package Contents: 1 set * 800m4 repair kit 1 inch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.